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Unformatted text preview: portillo (gdp347) homework 37 Turner (58185) 1 This printout should have 17 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 4) 10.0 points A traveling wave propagates according to the expression y = (4 . 39 cm) sin bracketleftBig (1 . 85 cm 1 ) x (3 . 5 s 1 ) t bracketrightBig , where x is in centimeters, and t is in seconds. Find the amplitude of the wave. Correct answer: 4 . 39 cm. Explanation: Let : A = 4 . 39 cm . Given a wave y = A sin( k x t ), the ampli tude of the wave is A = 4 . 39 cm . 002 (part 2 of 4) 10.0 points Determine the wavelength of the wave. Correct answer: 3 . 39632 cm. Explanation: Let : k = 1 . 85 cm 1 . The angular wave number of the wave is k , so = 2 k = 2 1 . 85 cm 1 = 3 . 39632 cm . 003 (part 3 of 4) 10.0 points Determine the frequency of the wave. Correct answer: 0 . 557042 Hz. Explanation: Let : = 3 . 5 s 1 . The angular frequency of the wave is , so f = 2 = 3 . 5 s 1 2 = . 557042 Hz . 004 (part 4 of 4) 10.0 points Determine the period of the wave. Correct answer: 1 . 7952 s. Explanation: The period of the wave is T = 1 f = 1 . 557042 Hz = 1 . 7952 s . 005 10.0 points The red light emitted by a HeNe laser has a wavelength of 633 nm in air and travels at 3 . 00 10 8 m/s. Find the frequency of the laser light. Correct answer: 4 . 73934 10 14 Hz. Explanation: Let : = 633 nm and v = 3 10 8 m / s . The speed of light is given by v = f f = v = 3 10 8 m / s 633 nm 10 9 nm 1 m = 4 . 73934 10 14 Hz . 006 10.0 points A wave on a string is described by the wave function y = (0 . 1 m) sin[(0 . 5 rad / m) x (20 rad / s) t ] Determine the frequency of oscillation of a particular point at x = 2 . 0 m. Correct answer: 3 . 1831 Hz. Explanation: Let : = 20 rad / s . In fact, when a wave with frequency f trav els along a string, any point of the string has the same oscillation frequency f . In this case, f = 2 = 20 rad / s 2 = 3 . 1831 Hz keywords: 007 (part 1 of 2) 10.0 points A steel piano wire is 0 . 7 m long and has a...
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This note was uploaded on 01/25/2012 for the course CHEM 302 taught by Professor Mccord during the Spring '10 term at University of Texas at Austin.
 Spring '10
 McCord

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